Edwards D374-20-000, Instruction

Page: 35 / 42

© Edwards Limited 2007. All rights reserved. Page 29
Edwards and the Edwards logo are trademarks of Edwards Limited.
Ma
in
te
na
nc
e
D374-20-880 Issue E
6 Maintenance
6.1 Inspect the Electrical Connections
Do the following checks regularly when maintaining the dry pumping system:
z
Check the iTIM and ensure that it is securely fixed in place.
z
Inspect the electrical cables and check that they are not damaged and have not overheated. Repair or
replace any damaged or overheated cable.
z
Inspect the electrical connections and check that they are secure. Tighten any loose connections.
6.2 Fault Finding
6.2.1 Tool Interface Problems
If the tool appears not be controlling the pump correctly, the state of the input and output signals may be checked
using the Single Equipment Monitor.
6.2.2 Error number reply messages
When the serial interface card acts on a command or query message, it sets the error number to indicate the success
or failure of the message. The error numbers returned in the error reply message are shown in
Table 16 .
6.2.3 Determine the pumping system error number
For further information on some of the errors, meanings and recommended actions, you can refer to the
corresponding warning or alarm message in the instruction manual supplied with the dry pumping system.
Each warning and alarm message has a pumping system error number. To determine which message(s) to refer to,
calculate the error number from information in the serial interface card reply messages as follows:
error number = ({parameter} x 100) + {alarm type}
Table 16 - Serial Interface Error Numbers
Error Number Meaning Possible cause/action
0 No error -
1 Invalid message The message sent was not a valid query or command
message.
2 Number not found Part of a message (e.g. {parameter}) was not found. Resend
the message in the correct format.
3 Number Invalid Part of a message was outside the valid range (e.g. the {0:1}
digit in a command message was higher than 1).
4 Parameter’s value not received The corresponding sensor may be faulty or disconnected.
Alternatively, you have requested a parameter value too
soon after you have connected or switched on the iTIM or
sending the !M0 message. Wait to allow the parameter data
to become available (this may take up to 45 seconds) then
request the value again.
5 Command not possible You have tried to take or release control, but another
module has control of the dry pumping system. Release
control from the other module, then try again.